Oki Develops World's First Single Channel 160 Gbit/s Optical Signal Transmitter
- Achieving 640km Long Distance Transmission -
Tokyo, Japan, July 9, 2004 -- Oki Electric Industry Co., Ltd. (TSE: 6703) today announced that it has developed the world's first single channel optical transmitter and receiver, succeeding to transmit 160 Gbit/s data over a distance of 640 km (approximately 396.8 miles) without forward-error correction, in an experimental level. Oki will exhibit this transmitter at the International Optoelectronics Exhibition '04 in Japan from July 13th, as the world's first 160 Gbit/s transmission experiment conducted at an exhibition.
Oki succeeded in developing this optical transmitter that sends 160-gigabit data, equivalent to approximately 4 movies (8 hours) of data, in a single second based on OTDM (Optical Time Division Multiplexing) technology. The OTDM module uses a free-space interconnected module structure for its delay-line circuit, which allows allocation of four 40Gbit/s optical modulators that utilize the space. By multiplexing four 40Gbit/s modulators, Oki succeeded in generating 160 Gbit/s optical signal.
"As high-capacity data is transmitted in a single second, this transmitter will make a strong impact not only to the telecommunication industry, but also to the digital movie distribution and the network computing industry," said Harushige Sugimoto, Chief Technology Officer at Oki Electric. "Oki plans to deploy sales to various research institutions as an interface equipment for ultra high capacity data transmission."
Because 160 Gbit/s optical signal is easily affected by temperature and tremor, it was difficult for a stable long-term communication and long distance transmission. In order to conduct a stable long-term communication, Oki also developed an optical carrier phase controller that monitors relative carrier phase difference and sends feedback signal to modulators to revise carrier phase differences. For long distance transmission, it is an advantage to generate carrier-suppressed signals that offset overlapping signals to reduce wave distortion, compared with an in-phase signal. Oki's free-space structure OTDM module can generate carrier-suppressed 160Gbit/s OTDM signals that enables a transmission distance of 640 km.
Oki plans shipment from 2005 to the worldwide market and aims to supply the transmitter and receiver as the future 160 Gbit/s core communication system that is expected to be in practical use from 2010. Part of this development was supported by a contract research from National Institute of Information and Communications Technology (NICT), the affiliated organization of Japan's Ministry of Public Management, Home Affairs, Posts and Telecommunications.
Oki's transmitter will be exhibited at International Optoelectronics Exhibition '04 at Anritsu Corporation's booth from July 13th to 16th. For more information, please go to http://www.oitda.or.jp/main/io/io04home.html
About Oki Electric Industry Co., Ltd.
Founded more than a century ago in 1881, Oki Electric Industry Co., Ltd. is Japan's first telecommunications manufacturer, with its headquarter in Tokyo, Japan. With the corporate vision, "Oki, Network Solutions for a Global Society," Oki Electric provides top-quality products, technologies and solutions to its customers through its telecommunications systems, information systems and electronic devices segments. All three segments are integrated into one effective organization that functions as a collective force to create exciting new products and technologies, including information and telecom converged solutions. Through its business activities, Oki Electric satisfies a spectrum of customer needs in various markets.
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[Reference: Diagram of transmission method comparison]
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